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According to genome.gov, All the cells in a person's body have the same DNA.
I understand that the main reason parents and children have different genomes is because of random mixing of 2 genomes, but that there are also very small differences caused by random mutations.
If all of a person's cells have identical genomes, then does that mean that random mutations only occur in gametes?
I also understand that if sunlight hits my arm, it can cause random mutations.
So do all cells in a person's body really have the same DNA?